% 绝对值之差函数
function y = fal_linear(x, a, d)
k1 = 1/(d^(1-a));
    
% y = x./(d^(1-a)) .* fsg0(x,d) + abs(fdb0(x,d)) .* abs(x).^a .* sign(x);


if abs(x) < d
    y = k1*x;
else
    y = x;
end
% y=x;


end